Add Kiro IDE support (.kiro/) (#548)

Co-authored-by: Sungmin Hong <hsungmin@amazon.com>

.kiro/steering/golang-patterns.md

@@ -0,0 +1,45 @@
+---
+inclusion: fileMatch
+fileMatchPattern: "*.go"
+description: Go-specific patterns including functional options, small interfaces, and dependency injection
+---
+
+# Go Patterns
+
+> This file extends the common patterns with Go specific content.
+
+## Functional Options
+
+```go
+type Option func(*Server)
+
+func WithPort(port int) Option {
+    return func(s *Server) { s.port = port }
+}
+
+func NewServer(opts ...Option) *Server {
+    s := &Server{port: 8080}
+    for _, opt := range opts {
+        opt(s)
+    }
+    return s
+}
+```
+
+## Small Interfaces
+
+Define interfaces where they are used, not where they are implemented.
+
+## Dependency Injection
+
+Use constructor functions to inject dependencies:
+
+```go
+func NewUserService(repo UserRepository, logger Logger) *UserService {
+    return &UserService{repo: repo, logger: logger}
+}
+```
+
+## Reference
+
+See skill: `golang-patterns` for comprehensive Go patterns including concurrency, error handling, and package organization.